0,0 → 1,198 |
/* DWARF2 EH unwinding support for AMD x86-64 and x86. |
Copyright (C) 2004-2015 Free Software Foundation, Inc. |
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This file is part of GCC. |
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GCC is free software; you can redistribute it and/or modify |
it under the terms of the GNU General Public License as published by |
the Free Software Foundation; either version 3, or (at your option) |
any later version. |
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GCC is distributed in the hope that it will be useful, |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
GNU General Public License for more details. |
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Under Section 7 of GPL version 3, you are granted additional |
permissions described in the GCC Runtime Library Exception, version |
3.1, as published by the Free Software Foundation. |
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You should have received a copy of the GNU General Public License and |
a copy of the GCC Runtime Library Exception along with this program; |
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
<http://www.gnu.org/licenses/>. */ |
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/* Do code reading to identify a signal frame, and set the frame |
state data appropriately. See unwind-dw2.c for the structs. |
Don't use this at all if inhibit_libc is used. */ |
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#ifndef inhibit_libc |
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/* There's no sys/ucontext.h for glibc 2.0, so no |
signal-turned-exceptions for them. There's also no configure-run for |
the target, so we can't check on (e.g.) HAVE_SYS_UCONTEXT_H. Using the |
target libc version macro should be enough. */ |
#if defined __GLIBC__ && !(__GLIBC__ == 2 && __GLIBC_MINOR__ == 0) |
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#include <signal.h> |
#include <sys/ucontext.h> |
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#ifdef __x86_64__ |
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#define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state |
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static _Unwind_Reason_Code |
x86_64_fallback_frame_state (struct _Unwind_Context *context, |
_Unwind_FrameState *fs) |
{ |
unsigned char *pc = context->ra; |
struct sigcontext *sc; |
long new_cfa; |
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/* movq $__NR_rt_sigreturn, %rax ; syscall. */ |
#ifdef __LP64__ |
#define RT_SIGRETURN_SYSCALL 0x050f0000000fc0c7ULL |
#else |
#define RT_SIGRETURN_SYSCALL 0x050f40000201c0c7ULL |
#endif |
if (*(unsigned char *)(pc+0) == 0x48 |
&& *(unsigned long long *)(pc+1) == RT_SIGRETURN_SYSCALL) |
{ |
struct ucontext *uc_ = context->cfa; |
/* The void * cast is necessary to avoid an aliasing warning. |
The aliasing warning is correct, but should not be a problem |
because it does not alias anything. */ |
sc = (struct sigcontext *) (void *) &uc_->uc_mcontext; |
} |
else |
return _URC_END_OF_STACK; |
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new_cfa = sc->rsp; |
fs->regs.cfa_how = CFA_REG_OFFSET; |
/* Register 7 is rsp */ |
fs->regs.cfa_reg = 7; |
fs->regs.cfa_offset = new_cfa - (long) context->cfa; |
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/* The SVR4 register numbering macros aren't usable in libgcc. */ |
fs->regs.reg[0].how = REG_SAVED_OFFSET; |
fs->regs.reg[0].loc.offset = (long)&sc->rax - new_cfa; |
fs->regs.reg[1].how = REG_SAVED_OFFSET; |
fs->regs.reg[1].loc.offset = (long)&sc->rdx - new_cfa; |
fs->regs.reg[2].how = REG_SAVED_OFFSET; |
fs->regs.reg[2].loc.offset = (long)&sc->rcx - new_cfa; |
fs->regs.reg[3].how = REG_SAVED_OFFSET; |
fs->regs.reg[3].loc.offset = (long)&sc->rbx - new_cfa; |
fs->regs.reg[4].how = REG_SAVED_OFFSET; |
fs->regs.reg[4].loc.offset = (long)&sc->rsi - new_cfa; |
fs->regs.reg[5].how = REG_SAVED_OFFSET; |
fs->regs.reg[5].loc.offset = (long)&sc->rdi - new_cfa; |
fs->regs.reg[6].how = REG_SAVED_OFFSET; |
fs->regs.reg[6].loc.offset = (long)&sc->rbp - new_cfa; |
fs->regs.reg[8].how = REG_SAVED_OFFSET; |
fs->regs.reg[8].loc.offset = (long)&sc->r8 - new_cfa; |
fs->regs.reg[9].how = REG_SAVED_OFFSET; |
fs->regs.reg[9].loc.offset = (long)&sc->r9 - new_cfa; |
fs->regs.reg[10].how = REG_SAVED_OFFSET; |
fs->regs.reg[10].loc.offset = (long)&sc->r10 - new_cfa; |
fs->regs.reg[11].how = REG_SAVED_OFFSET; |
fs->regs.reg[11].loc.offset = (long)&sc->r11 - new_cfa; |
fs->regs.reg[12].how = REG_SAVED_OFFSET; |
fs->regs.reg[12].loc.offset = (long)&sc->r12 - new_cfa; |
fs->regs.reg[13].how = REG_SAVED_OFFSET; |
fs->regs.reg[13].loc.offset = (long)&sc->r13 - new_cfa; |
fs->regs.reg[14].how = REG_SAVED_OFFSET; |
fs->regs.reg[14].loc.offset = (long)&sc->r14 - new_cfa; |
fs->regs.reg[15].how = REG_SAVED_OFFSET; |
fs->regs.reg[15].loc.offset = (long)&sc->r15 - new_cfa; |
fs->regs.reg[16].how = REG_SAVED_OFFSET; |
fs->regs.reg[16].loc.offset = (long)&sc->rip - new_cfa; |
fs->retaddr_column = 16; |
fs->signal_frame = 1; |
return _URC_NO_REASON; |
} |
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#else /* ifdef __x86_64__ */ |
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#define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state |
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static _Unwind_Reason_Code |
x86_fallback_frame_state (struct _Unwind_Context *context, |
_Unwind_FrameState *fs) |
{ |
unsigned char *pc = context->ra; |
struct sigcontext *sc; |
long new_cfa; |
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/* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */ |
if (*(unsigned short *)(pc+0) == 0xb858 |
&& *(unsigned int *)(pc+2) == 119 |
&& *(unsigned short *)(pc+6) == 0x80cd) |
sc = context->cfa + 4; |
/* movl $__NR_rt_sigreturn,%eax ; int $0x80 */ |
else if (*(unsigned char *)(pc+0) == 0xb8 |
&& *(unsigned int *)(pc+1) == 173 |
&& *(unsigned short *)(pc+5) == 0x80cd) |
{ |
struct rt_sigframe { |
int sig; |
siginfo_t *pinfo; |
void *puc; |
siginfo_t info; |
struct ucontext uc; |
} *rt_ = context->cfa; |
/* The void * cast is necessary to avoid an aliasing warning. |
The aliasing warning is correct, but should not be a problem |
because it does not alias anything. */ |
sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext; |
} |
else |
return _URC_END_OF_STACK; |
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new_cfa = sc->esp; |
fs->regs.cfa_how = CFA_REG_OFFSET; |
fs->regs.cfa_reg = 4; |
fs->regs.cfa_offset = new_cfa - (long) context->cfa; |
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/* The SVR4 register numbering macros aren't usable in libgcc. */ |
fs->regs.reg[0].how = REG_SAVED_OFFSET; |
fs->regs.reg[0].loc.offset = (long)&sc->eax - new_cfa; |
fs->regs.reg[3].how = REG_SAVED_OFFSET; |
fs->regs.reg[3].loc.offset = (long)&sc->ebx - new_cfa; |
fs->regs.reg[1].how = REG_SAVED_OFFSET; |
fs->regs.reg[1].loc.offset = (long)&sc->ecx - new_cfa; |
fs->regs.reg[2].how = REG_SAVED_OFFSET; |
fs->regs.reg[2].loc.offset = (long)&sc->edx - new_cfa; |
fs->regs.reg[6].how = REG_SAVED_OFFSET; |
fs->regs.reg[6].loc.offset = (long)&sc->esi - new_cfa; |
fs->regs.reg[7].how = REG_SAVED_OFFSET; |
fs->regs.reg[7].loc.offset = (long)&sc->edi - new_cfa; |
fs->regs.reg[5].how = REG_SAVED_OFFSET; |
fs->regs.reg[5].loc.offset = (long)&sc->ebp - new_cfa; |
fs->regs.reg[8].how = REG_SAVED_OFFSET; |
fs->regs.reg[8].loc.offset = (long)&sc->eip - new_cfa; |
fs->retaddr_column = 8; |
fs->signal_frame = 1; |
return _URC_NO_REASON; |
} |
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#define MD_FROB_UPDATE_CONTEXT x86_frob_update_context |
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/* Fix up for kernels that have vDSO, but don't have S flag in it. */ |
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static void |
x86_frob_update_context (struct _Unwind_Context *context, |
_Unwind_FrameState *fs ATTRIBUTE_UNUSED) |
{ |
unsigned char *pc = context->ra; |
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/* movl $__NR_rt_sigreturn,%eax ; {int $0x80 | syscall} */ |
if (*(unsigned char *)(pc+0) == 0xb8 |
&& *(unsigned int *)(pc+1) == 173 |
&& (*(unsigned short *)(pc+5) == 0x80cd |
|| *(unsigned short *)(pc+5) == 0x050f)) |
_Unwind_SetSignalFrame (context, 1); |
} |
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#endif /* ifdef __x86_64__ */ |
#endif /* not glibc 2.0 */ |
#endif /* ifdef inhibit_libc */ |